package com.hmdp.utils;

import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.format.annotation.DateTimeFormat;
import org.springframework.stereotype.Component;

import javax.annotation.Resource;
import java.time.LocalDateTime;
import java.time.ZoneOffset;
import java.time.format.DateTimeFormatter;

@Component
public class RedisIdWorker {
    /**
     *
     * 开始时间戳
     */

    private static final Long BEGIN_TIMESTAMP=1735689600L;
    /**
     * 序列号位数
     */
    private static final int COUNT_BITS=32;
    @Resource
    private StringRedisTemplate stringRedisTemplate;

    public long nextId(String keyPrefix) {
        //1生成时间戳
        LocalDateTime now = LocalDateTime.now();
        long nowSecond = now.toEpochSecond(ZoneOffset.UTC);
        long timeStamp = nowSecond - BEGIN_TIMESTAMP;
        //2生成序列号
        //2.1获取当前日期,精确到天
        String date = now.format(DateTimeFormatter.ofPattern("yyyy:MM:dd"));

        long count = stringRedisTemplate.opsForValue().increment("icr:" + keyPrefix + ":" + date);

        //拼接并返回

        return timeStamp<<COUNT_BITS | count;

    }

    public static void main(String[] args) {
        LocalDateTime localDateTime = LocalDateTime.of(2025, 1, 1, 0, 0, 0);
        long second = localDateTime.toEpochSecond(ZoneOffset.UTC);
        System.out.println(second);

    }

}
